JPH11213760A - Coated electric wire and method for peeling coating of electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten the economical recycling properties of both of a conductor and a coating layer by making it easy to separate the conductor and the coating. SOLUTION: This coated electric wire 1 comprises a conductor part 2 and a coating layer 3 formed on the outer circumference of the conductor part 2 by extrusion coating. The coating layer 3 is formed from a resin composition containing 100 pts.wt. of polyvinyl chloride resin and 2-10 pts.wt. of metal soap having melting point >=200 deg.C. The metal soap comprises at least one compound selected from lithium stearate, barium stearate, dibasic lead stearate and barium laurate. At the time of parting the coating layer 3 from the conductor part 2, the coated electric wire 1 is heated to 200-300 deg.C and higher than the melting point of the metal soap and then parting the coating layer 3 for the conductor part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a covered electric wire in which the outer periphery of a conductor is covered with a covering material layer, and a method of peeling the covered wire.

[0002]

2. Description of the Related Art Conventionally, there is an insulated wire insulated with a coating material layer made of polyvinyl chloride resin, polyethylene resin, or the like on the outer periphery of a copper or copper-plated conductor portion. Usually, copper as a conductor portion is recovered by a coating stripping method by forcibly peeling the coating material layer from the conductor portion, and copper is reused.

[0003] In the case of small-diameter insulated wires, the above-mentioned stripping method is difficult to employ, so that the insulated wires are shredded and then sieved to separate and collect copper as a conductor portion, thereby reusing copper. The method of aiming was adopted.

[0004]

However, according to the method of forcibly peeling off the coating material layer, the conductor portion and the coating material layer are usually in close contact with each other, and the two are completely separated from each other. Was impossible.

[0005] Further, according to the method of separating and recovering the covered electric wire by means of a sieve, copper cannot be completely recovered.
There is a problem that copper dust is mixed in the residue after the copper is recovered.

[0006] In fact, the actual situation of the recycling of the coated electric wire is that only the copper, which is the conductor, is reused.

On the other hand, a method of reusing industrial waste made of a synthetic resin material such as a coating material layer by dissolving it with a solvent and a method of reusing it as a combustion aid have been studied. Problems remain in terms of productivity, economy, performance, etc., and have not yet been put to practical use. For this reason, such residues have been landfilled in the soil. However, there has been a problem that it is becoming more difficult every year to secure a landfill disposal site and the processing cost increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a covered electric wire and a method of stripping the covered wire, in which the conductor portion and the covering material layer are easily separated from each other, thereby improving the recyclability of both. I do.

[0009]

The technical means of a covered electric wire for solving the above-mentioned problems is to provide a covered electric wire provided with a covering material layer which covers and contacts an outer periphery of a conductor portion.
The coating material layer consists of a resin composition in which 2 to 10 parts by weight of a metal soap having a melting point of 200 ° C. or more is blended with respect to 100 parts by weight of a polyvinyl chloride resin.

The metal soap may have a structure composed of one or more selected from lithium stearate, barium stearate, dibasic lead stearate, and barium laurate.

[0011] The technical means of the stripping method for solving the above-mentioned problem is a stripping method of the coated electric wire in which the coating material layer in the above-mentioned coated electric wire is separated from the conductor portion. 200-300 ° C above the melting point of
After heating to a thickness of 0.5 mm, the coating material layer is peeled off from the conductor.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a covered electric wire according to the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a covered electric wire, and a conductor 2 disposed at a central portion thereof.
And a coating material layer 3 formed by extrusion coating the outer periphery of the conductor portion 2.

The conductor portion 2 has a stranded structure in which a plurality of conductor wires 2a made of copper or the like are twisted.

The coating material layer 3 is formed of a resin composition in which 2 to 10 parts by weight of a metal soap having a melting point of 200 ° C. or more is blended with 100 parts by weight of a polyvinyl chloride resin (PVC resin).

At this time, it is preferable to use a PVC resin having an average degree of polymerization of 1000 to 3000 as a coating material, and if necessary, a plasticizer, a heat stabilizer,
A compounding agent such as a filler, an antioxidant, a lubricant, a flame retardant, and a pigment may be appropriately added.

[0016] As the metal soap having good releasability, there are lithium stearate, barium stearate, dibasic lead stearate and barium laurate, and one or more of these can be selected. What is necessary is just to mix.

The coated electric wire 1 of the present embodiment is configured as described above, and when extruding the coating material layer 3 on the outer periphery of the conductor portion 2, the melting point of the metal soap mixed with the PVC resin is 200 ° C. or more. Therefore, at around 160 to 190 ° C., which is the extrusion temperature of the PVC resin, the metal soap does not melt, and good extrusion processability can be secured without any hindrance.

When the covering material layer 3 of the covered wire 1 is peeled off after use, the covered wire 1 is heated to 200 to 300 ° C., which is higher than the melting point of metallic soap, and then the covering material The layer 3 may be peeled off.

As a heating method, a known heating method such as a gear oven or an electric heater may be used.

Then, the coating material layer 3 is formed by the heat treatment.
Since the metal soap inside melts on the surface of the conductor portion 2, the releasability between the conductor portion 2 and the coating material layer 3 is improved, and the conductor soap 2 can be easily peeled off, and the conductor portion 2 and the coating material layer 3 are separated. Can be easily performed.

Here, the conductor portion 2 and the coating material layer 3 can be more completely separated, and the recyclability of both can be improved economically. Therefore, there is an advantage that it is not necessary to perform a landfill treatment as in the related art, and the environment resistance is excellent.

When the amount of the metal soap compounded in the PVC resin is less than 2 parts by weight, the above-mentioned good releasability cannot be ensured. When the amount of the metal soap exceeds 10 parts by weight, The metal soap is severely melted on the surface of the conductor portion 2, making it difficult to grasp the conductor portion 2 at the time of the peeling operation, resulting in a difficulty in workability.

When the melting point of the metal soap compounded in the PVC resin is less than 200 ° C., slipping between the conductor portion 2 and the coating material layer 3 occurs due to melting of the metal soap during kneading and extrusion. Occurs, and it is difficult to process the coated wire 1 in a satisfactory manner.

Further, the heat treatment temperature of the insulated wire 1 is 20
When the temperature is lower than 0 ° C., the metal soap does not melt, the expected peelability cannot be obtained, and the metal soap sufficiently melts at a heat treatment temperature of up to 300 ° C., so that 300 ° C. or higher is unnecessary. If the temperature is too high, it becomes a steamed state and the coating material layer 3
May be carbonized.

FIG. 2 shows a second embodiment of a covered electric wire according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

That is, the coated electric wire 1 in this embodiment is
It has a structure in which two inner and outer coating layers 3 and 4 are provided, and the inner coating layer 3 that contacts the outer periphery of the conductor portion 2 is the first coating layer.
Of the outer covering material layer 4
Is made of, for example, only a PVC resin.

In this embodiment, the same effect as that of the first embodiment can be obtained by performing the same coating peeling method as that of the first embodiment. In addition, since the structure is provided with the inner and outer coating layers 3 and 4 and the metal soap is mixed only into the inner coating layer 3, there is an advantage that the amount of metal soap used can be reduced.

FIG. 3 shows a third embodiment of a covered electric wire according to the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and their description is omitted.

That is, the coated electric wire 1 in the present embodiment is
The conductor portion 2 has a single-line structure including one conductor wire 2a.

Then, the plurality of covered electric wires 1 are attached to the adhesive tape 6.
The structure is bound and protected by winding.

In this embodiment, if the same coating stripping method as in the first embodiment is carried out, the same effect as in the first embodiment can be obtained, and the adhesive layer of the adhesive tape 6 and each coated electric wire can be obtained. Since the metal soap dissolves between itself and one surface, there is an advantage that the operation of removing the adhesive tape 6 can be easily performed.

[0032]

As described above, according to the coated electric wire of the present invention, the coating material layer contains 2 to 10 parts by weight of a metal soap having a melting point of 200 ° C. or more with respect to 100 parts by weight of the polyvinyl chloride resin. Resin soap, and as the metal soap, lithium stearate, barium stearate, dibasic lead stearate, one or two or more selected from barium laurate,
After the coated electric wire is heated to 200 to 300 ° C., which is equal to or higher than the melting point of the metal soap, the metal soap is melted on the surface of the conductor by adopting a coating stripping method of separating the coating material layer from the conductor. The peelability between the material layer and the conductor layer is improved, and the conductor part and the coating material layer can be easily separated.
There is an advantage that the conductor portion and the coating material layer can be more completely separated, and the recyclability of both can be increased economically.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a covered electric wire according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the covered electric wire according to the present invention.

FIG. 3 is a sectional view showing a third embodiment of the covered electric wire according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulated wire 2 Conductor part 3 Coating material layer

Claims (3)

[Claims] 1. A covered electric wire comprising a covering material layer for covering and contacting the outer periphery of a conductor portion, wherein the covering material layer has a melting point of 200 ° C. or more with respect to 100 parts by weight of a polyvinyl chloride resin. A covered electric wire comprising a resin composition containing 2 to 10 parts by weight of soap. 2. The metal soap comprises lithium stearate, barium stearate, dibasic lead stearate,
2. The coated electric wire according to claim 1, comprising one or more selected from barium laurate. 3. The method for stripping a covered electric wire according to claim 1 or 2, wherein the covering material layer of the covered electric wire is separated from a conductor portion, wherein the coated electric wire has a melting point of 200 to 30 or more.
A method for stripping a coated electric wire, comprising heating the coating to a temperature of 0 ° C. and then stripping the coating layer from the conductor.